JP7374663B2 - optical sensor - Google Patents

Description

The present invention relates to an optical sensor that detects an object using a light emitting element and a light receiving element.

A transmission-type photointerrupter as a conventional optical sensor uses a light-emitting element such as an LED and a light-receiving element such as a phototransistor to block light when an object to be detected passes between the light-emitting element and the light-receiving element. Detects the detected object.

The transmissive photointerrupter disclosed in Patent Document 1 has a surface-mounted light emitting element and a light receiving element mounted on the same surface of a substrate, and a casing having a reflective surface inside the substrate on which these elements are mounted. The body is assembled. The light emitted from the light emitting element in the vertical direction is reflected twice by the reflective surface of the housing, and then enters the light receiving element from the vertical direction.

In such optical sensors, the casing that is later assembled onto the board on which the light-emitting element and light-receiving element are mounted can be replaced with a light guide made of transparent resin instead of the casing with a reflective surface provided inside. realizable. In this case, the light emitted from the light emitting element in the vertical direction is guided by the light guide and enters the light receiving element from the vertical direction through internal reflection.

Japanese Patent Application Publication No. 11-274550

However, when a casing with a reflective surface inside is later assembled to a board on which a light emitting element and a light receiving element are mounted, the reflective surface must be positioned at an appropriate position in order to guide the light from the light emitting element to the light receiving element. There is a need. Therefore, a gap is created between the substrate and the casing between the light emitting element and the light receiving element. In this case, the light from the light-emitting element is not only reflected by the reflective surface and indirectly incident on the light-receiving element, but also directly enters the light-receiving element through the above-mentioned gap. That is, the light-receiving element is affected by the light that is directly incident through the above-mentioned gap, and there is a problem that the presence or absence of an object cannot be accurately detected.

In addition, if the retrofitted housing is replaced with a light guide made of transparent resin, the light guide is made of transparent resin, so the light from the light emitting element will directly enter the light receiving element regardless of the presence or absence of the gap mentioned above. Therefore, there was a problem that the presence or absence of an object could not be detected correctly.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an optical sensor that is inexpensive and has a simple configuration, which is capable of correctly detecting an object without being affected by light directly incident from a light emitting element to a light receiving element. That's true.

A typical configuration of the present invention for achieving the above object includes a light emitting element that emits light, a light receiving element that receives light from the light emitting element through a space through which a detection object passes, and a plurality of electronic circuits. An optical sensor that detects the object by blocking light from the light emitting element in the space, the light emitting element, the plurality of electronic circuit elements, and the light receiving element. The elements are mounted on the same surface of the substrate, and the plurality of electronic circuit elements are arranged between the light emitting element and the light receiving element on the mounting surface of the substrate , and the electronic circuit elements are arranged at the center of the light emission source of the light emitting element. The plurality of electronic circuit elements are arranged at different positions in a direction intersecting a line connecting the centers of the light-receiving areas of the light-receiving elements.

According to the present invention, it is possible to accurately detect an object without being affected by light directly incident from a light emitting element to a light receiving element, and it is possible to provide an optical sensor that is inexpensive and has a simple configuration.

(a) is a perspective view of the optical sensor in Example 1, (b) is a top view of the optical sensor in Example 1 (a) is a cross-sectional view of an optical sensor in a comparative example, (b) is a cross-sectional view of an optical sensor in Example 1 Circuit diagram showing an equivalent circuit of the optical sensor in Example 1 A diagram showing the output characteristics of the optical sensor in Example 1 (a) is a perspective view of the optical sensor in Example 2, (b) is a top view of the optical sensor in Example 2 A diagram showing a component layout of an optical sensor in Example 2 Cross-sectional view of the optical sensor in Example 3

Hereinafter, preferred embodiments of the present invention will be described in detail by way of example with reference to the drawings. However, the dimensions, materials, shapes, and relative arrangements of the components described in the following embodiments should be changed as appropriate depending on the configuration of the device to which the present invention is applied and various conditions, and the It is not intended to limit the scope of the invention only to these.

[Example 1]
An optical sensor according to Example 1 of the present invention will be explained using FIG. 1. FIG. 1(a) is a perspective view of the optical sensor in Example 1, and FIG. 1(b) is a top view of the optical sensor in Example 1.

The optical sensor 100 according to the first embodiment includes a light emitting element 101 that emits light, a light receiving element 103 that receives light from the light emitting element 101 through a space 110 through which an object to be detected passes, and an electronic circuit element 102. It is equipped with The optical sensor 100 detects the object by changing the amount of light received by the light receiving element 103 when the object blocks the light from the light emitting element 101 in the space 110.

The light emitting element 101 has a light emitting source 101a that emits light. Here, a surface mount type LED is used as the light emitting element 101. The light emitting element 101 is an optical axis vertical type LED that emits light in a direction perpendicular to the substrate 104. Further, the light receiving element 103 has a light receiving area 103a that receives light. Here, a phototransistor (Ptr) is used as the light receiving element 103. The light receiving element 103 is an optical-axis vertical phototransistor that receives light in a direction perpendicular to the substrate 104 .

On the substrate 104, in addition to the light emitting element 101 and the light receiving element 103 forming a transmissive photointerrupter, an electronic circuit element 102, a CPU 121, and a memory 122 are mounted on the same surface. The electronic circuit element 102 is arranged between the light emitting element 101 and the light receiving element 103 on the mounting surface of the substrate 104. A light emitting element 101 and a light receiving element 103 that constitute a photointerrupter, which is an optical sensor, are reflow mounted on a substrate 104 at the same time as other components such as the electronic circuit element 102 described above. That is, the electronic circuit element 102 is an element (component) that can be reflow mounted, and is mounted on the same substrate 104 along with the light emitting element 101 and the light receiving element 103 by an automatic mounting device (not shown) that mounts the element at a predetermined position on the substrate 104. mounted on the surface.

The electronic circuit element 102 is arranged between the light emitting element 101 and the light receiving element 103 on the mounting surface of the substrate 104. The electronic circuit element 102 is arranged on a line DL connecting the center of the light emitting source 101a of the light emitting element 101 and the center of the light receiving area 103a of the light receiving element 103. Here, the electronic circuit element 102 uses a chip resistor that is not electronically connected to the light emitting element 101 and the light receiving element 103 mounted on the substrate 104. Further, the electronic circuit element 102 uses a chip resistor of the same size as the LED used in the light emitting element 101.

The optical sensor 100 includes a light guide 105 as a light guiding member. The light guide 105 is attached afterward to the substrate 104 on which the light emitting element 101, the electronic circuit element 102, and the light receiving element 103 are reflow mounted. The light guide 105 is made of transparent acrylic resin, and guides the light vertically emitted from the light emitting element 101 by internal reflection of the sloped part to the vertical direction of the light receiving element 103 . Specifically, the light guide 105 includes a first light guide section 105a, a second light guide section 105b, and a connecting section 105c that connects the first light guide section 105a and the second light guide section 105b. are integrally formed. The first light guiding section 105a guides the light emitted from the light emitting element 101 in a direction passing through the space 110. The second light guide section 105b is provided to face the first light guide section 105a via the space 110, and guides the light that has passed through the space 110 to the light receiving element 103. The connecting portion 105c is hollow on the mounting surface side of the substrate 104. The electronic circuit element 102 is disposed on the mounting surface of the substrate 104 between the light emitting element 101 and the light receiving element 103 at a position corresponding to the connecting portion 105c of the light guide 105 of the substrate 104.

The space 110 is located between the first light guide section 105a and the second light guide section 105b, which are provided facing each other, and allows light emitted from the light emitting element 101 in the vertical direction to be guided to the light receiving element 103. It's on the street. If there is an object to be detected in this space 110, the optical path is blocked, so that the light emitted from the light emitting element 101 in the vertical direction does not reach the light receiving element 103. As a result, the amount of light received by the light receiving element 103 changes, and the object is detected.

FIG. 2 shows a cross-sectional view of the optical sensor. FIG. 2(a) is a cross-sectional view of an optical sensor of a comparative example, showing a configuration in which there is no electronic circuit element between the light emitting element and the light receiving element. FIG. 2(b) is a cross-sectional view of the optical sensor of Example 1, showing a configuration in which an electronic circuit element is provided between a light emitting element and a light receiving element. In the figure, a solid arrow indicates an optical path along which light emitted vertically from the light emitting element 101 is guided to the light receiving element 103. An arrow shown by a broken line indicates an optical path of light emitted from the light emitting element 101 in the horizontal direction toward the light receiving element 103.

In the case of the light-emitting element 101, which is an optical-axis vertical LED, most of the emitted light is emitted in the vertical direction, but light is also emitted in directions other than the vertical direction. Further, although the optical axis vertical phototransistor that is the light receiving element 103 has high sensitivity to light incident from a vertical direction, it is also sensitive to light incident from a direction other than the vertical direction.

As shown by the broken line arrow in FIG. 2A, if there is no electronic circuit element between the light emitting element 101 and the light receiving element 103 on the mounting surface of the board 104, the light emitted from the light emitting element 101 in the horizontal direction is The light is incident on the light receiving element 103 regardless of the presence or absence of a detection object in the space 110.

As shown by the broken line arrow in FIG. 2(b), when the electronic circuit element 102 is located between the light emitting element 101 and the light receiving element 103 on the mounting surface of the board 104, the light emitted from the light emitting element 101 in the horizontal direction is , is blocked by the electronic circuit element 102 and does not enter the light receiving element 103.

The equivalent circuit and output characteristics of the optical sensor in this example will be explained using FIGS. 3 and 4. FIG. 3 is a circuit diagram showing an equivalent circuit of the optical sensor in Example 1. FIG. 4 is a diagram showing the output characteristics of the optical sensor in Example 1.

As shown in FIG. 3, the light emitting element 101 is an LED, and its anode is connected to a DC power source via a current limiting resistor 111, and its cathode is connected to GND. The light receiving element 103 is a phototransistor (Ptr), and its collector is connected to a power supply via a pull-up resistor 112, and its emitter is connected to GND.

The voltage output section 113 is connected to the collector of the phototransistor which is the light receiving element 103, and indicates the voltage between the collector terminal of the phototransistor and GND. The voltage output section 113 outputs L when the phototransistor, which is the light receiving element 103, is on and when light is incident on the phototransistor. On the other hand, the voltage output section 113 outputs H when the phototransistor, which is the light receiving element 103, is off and no light is incident on the phototransistor.

The horizontal axis shown in FIG. 4 represents the current (mA) flowing through the light emitting element 101. The amount of light emitted by the light emitting element 101 is proportional to the flowing current. The vertical axis shown in FIG. 4 represents the voltage (V) of the voltage output section 113. Here, during the experiment, the DC input voltage was 3.3V, and the LED was rated at 50mA. Note that during the experiment, the LED was used at 40 mA.

In FIG. 4, data indicated by a solid line indicates that there is no detected object in the space 110 of the optical sensor, and that the electronic circuit element 102 is present between the light emitting element 101 and the light receiving element 103. The broken line data indicates a state in which a detection object is “present” in the space 110 of the optical sensor and an electronic circuit element 102 is “absent” between the light emitting element 101 and the light receiving element 103. The dotted line data indicates a state in which a detection object is "present" in the space 110 of the optical sensor, and an electronic circuit element 102 is "absent" between the light emitting element 101 and the light receiving element 103.

In the optical sensor, when there is an object to be detected in the space 110, the light from the light emitting element 101 is blocked by the object, so the light receiving element 103 is in a state where no light is incident, and outputs H. On the other hand, when there is no detection object in the space 110, the light from the light emitting element 101 is not blocked by the detection object, so the light receiving element 103 enters a state where light is incident, and the output is L. The optical sensor needs to output an output depending on the presence or absence of a detection object, without depending on the amount of light emitted by the light emitting element 101.

The data shown by the solid line indicates that among the light emitted from the light emitting element 101, the light emitted from the light emitting element 101 in the horizontal direction is blocked by the electronic circuit element 102 between the light emitting element 101 and the light receiving element 103 (see FIG. 2). . Therefore, the amount of light received by the light-receiving element 103 is the output L, independent of the current flowing through the LED, which is the light-emitting element 101, that is, the amount of light emitted from the light-emitting element. Therefore, the optical sensor can determine whether there is an object to be detected.

The data indicated by the broken line indicates that in addition to the light emitted from the light emitting element 101 being reflected by the internal reflection of the light guide 105 and indirectly incident on the light receiving element 103, the light emitted from the light emitting element 101 in the horizontal direction is received. The light is directly incident on the element 103. Therefore, the amount of light received by the light receiving element 103 changes depending on the current flowing through the light emitting element 101, that is, the amount of light emitted from the light emitting element 101, and the output H and the output L change. Therefore, the optical sensor is affected by the light that directly enters the light-receiving element from the light-emitting element, and cannot determine the presence or absence of a detected object.

The data indicated by the dotted line indicates that among the light emitted from the light emitting element 101, the light emitted from the light emitting element 101 in the horizontal direction is blocked by the electronic circuit element 102 between the light emitting element 101 and the light receiving element 103 (see FIG. 2). . Therefore, the amount of light received by the light-receiving element 103 is an output H regardless of the current flowing through the LED, which is the light-emitting element 101, that is, the amount of light emitted from the light-emitting element. Therefore, the optical sensor can determine the presence of a detection object.

The voltage of the voltage output section 113 is normally connected to a logic IC, and compared with a reference voltage inside the logic IC, it is determined to have two values, an output H and an output L. For example, a logic IC that operates with an input of 3.3V recognizes 2.6V or more as an output H and 0.6V or less as an output L, and cannot correctly recognize an output H or an output L between 0.6V and 2.6V.

The amount of light emitted by the light emitting element 101 changes depending on ambient temperature conditions and cumulative lighting time. The amount of light emitted by the light emitting element 101 also includes variations in the luminous efficiency of the light emitting element 101, variations in the optical axis, variations in the sensitivity of the light receiving element 103, and variations in internal reflection of the light guide, which is a clear mold. Therefore, it is necessary to output an output depending on the presence or absence of the detected object, without depending on the amount of light emitted by the light emitting element 101.

However, as described above, in the optical sensor, if there is light that is directly incident from the light emitting element 101 to the light receiving element 103, it is not possible to correctly determine the presence or absence of a detected object in the space 110 (as shown by the broken line in FIG. 4). (see data).

Therefore, it can be seen that it is effective to arrange the electronic circuit element 102 between the light emitting element 101 and the light receiving element 103 and to block the light that is directly incident on the light receiving element 103 from the light emitting element 101 with the electronic circuit element 102.

If the electronic circuit element 102 is composed of a chip resistor as in this embodiment, the electronic circuit element 102 is mounted at the same time when the light emitting element 101 and the light receiving element 103 are mounted on the substrate 104 using an automatic mounting device. However, it is possible to pass it through a reflow oven as it is. Further, general-purpose chip resistors have the advantage that they are available at low cost and can be selected from a variety of sizes. Therefore, by placing an electronic circuit element between the light-emitting element and the light-receiving element on the mounting surface (same surface) of the board, it is possible to detect the object without being affected by the light that enters directly from the light-emitting element to the light-receiving element. It is possible to provide an optical sensor that can be carried out correctly and has an inexpensive and simple configuration.

In addition, in a configuration in which the light guide is assembled to the board later, there is no need to provide the light guide, which is the light guide member, with a mechanism to prevent light from directly entering the light emitting element in the horizontal direction from the light emitting element to the light receiving element. can be made into an inexpensive and simple configuration.

In this embodiment, a chip resistor mounted on the same surface of a substrate is illustrated as the electronic circuit element 102, but the present invention is not limited to this. Electronic circuit elements such as chip ceramic capacitors, chip beads, connectors, coils, and chip jumpers that are not electronically connected to light emitting elements or light receiving elements, as well as heat-resistant parts other than electronic circuit elements, can be mounted using automatic mounting equipment. Any part that can be passed through a reflow oven and blocks light is fine.

Further, the effect can be obtained if the electronic circuit element 102 disposed between the light emitting element 101 and the light receiving element 103 is configured to block a part of the space between the light emitting element and the light receiving element on the mounting surface of the board. However, it is preferable to select a member for the electronic circuit element 102 that is thicker than the height of the light emitting element 101 or the light receiving element 103.

Further, even when a light guide made of transparent resin is used as a light guiding member that is attached to the substrate later, there is no need to provide the light guide with a mechanism for preventing light from directly entering the light receiving element in the horizontal direction from the light emitting element. Therefore, the optical sensor can be provided with an inexpensive and simple configuration.

[Example 2]
An optical sensor according to a second embodiment of the present invention will be described using FIGS. 5 and 6. In the second embodiment, descriptions of components similar to those in the first embodiment will be omitted. 5(a) is a perspective view of the optical sensor in Example 2, and FIG. 5(b) is a top view of the optical sensor in Example 2. FIG. 6 is a diagram showing a component layout and wiring pattern of an optical sensor in Example 2.

The equivalent circuit diagram of the optical sensor in Example 2 is the same as that explained in Example 1 using FIG. 3, so it will be omitted.

In the second embodiment, the electronic circuit element disposed between the light emitting element 101 and the light receiving element 103 is a part of a component constituting a drive circuit that drives the light emitting element 101 or the light receiving element 103. Specifically, the current limiting resistor 111 of the light emitting element 101 and the pull-up resistor 112 of the light receiving element 103 also serve as electronic circuit elements disposed between the light emitting element 101 and the light receiving element 103. As shown in FIGS. 5 and 6, in addition to the light emitting element 101, current limiting resistor 111, pull-up resistor 112, and light receiving element 103, a CPU 121 and a memory 122 are mounted on the same surface of the substrate 104. A current limiting resistor 111 and a pull-up resistor 112, which are electronic circuit elements, are arranged between the light emitting element 101 and the light receiving element 103 on the mounting surface (same surface) of the substrate 104. In the second embodiment, the current limiting resistor 111 and the pull-up resistor 112 function as electronic circuit elements that block light directly entering the light receiving element 103 from the light emitting element 101.

Further, in the second embodiment, a plurality of electronic circuit elements are provided between the light emitting element 101 and the light receiving element 103. The current limiting resistor 111 and the pull-up resistor 112, which are a plurality of electronic circuit elements, are arranged at different positions between the light emitting element 101 and the light receiving element 103. Specifically, the current limiting resistor 111 and the pull-up resistor 112 are mounted with their positions shifted in the vertical direction in FIG. The current limiting resistor 111 and the pull-up resistor 112 are arranged at different positions in a direction intersecting the line DL connecting the center of the light emitting source 101a of the light emitting element 101 and the center of the light receiving area 103a of the light receiving element 103. Although a configuration in which the current limiting resistor 111 and the pull-up resistor 112 are arranged at a position intersecting the connecting line DL is illustrated here, the present invention is not limited to this. When a plurality of electronic circuit elements are arranged at different positions in a direction intersecting the line DL connecting the center of the light emitting source 101a of the light emitting element 101 and the center of the light receiving area 103a of the light receiving element 103, the light emitting element and the light receiving element At least one electronic circuit element may be placed on the connecting line between the two. Furthermore, the current limiting resistor 111 and pull-up resistor 112 used in this embodiment are components smaller in size than the light emitting element 101 and the light receiving element 103. By shifting the positions of the current limiting resistor 111 and the pull-up resistor 112 and mounting them on the same surface of the substrate 104, the optical path of the light emitted horizontally from the light emitting element 101 and entering the light receiving element 103 from the horizontal direction can be changed. It is configured to block it.

As explained above, the current limiting resistor 111 and the pull-up resistor 112, which are components of the drive circuit that drives the light emitting element 101 and the light receiving element 103, are arranged as electronic circuit elements between the light emitting element 101 and the light receiving element 103. It is configured to serve as both. This eliminates the cost increase caused by adding electronic circuit elements.

Further, the positions of the current limiting resistor 111 and the pull-up resistor 112, which are a plurality of electronic circuit elements, are shifted and mounted on the same surface of the substrate 104. As a result, even if parts smaller in size than the light emitting element 101 and the light receiving element 103 are used for the current limiting resistor 111 and the pull up resistor 112, they can function as electronic circuit elements disposed between the light emitting element 101 and the light receiving element 103. I can do it.

[Example 3]
An optical sensor according to Example 3 of the present invention will be described using FIG. 7. In the third embodiment, descriptions of components similar to those in the first and second embodiments will be omitted. FIG. 7 is a sectional view of the optical sensor in this example.

The optical sensor in Example 3 includes a black casing 108 that includes reflective surfaces 109a and 109b instead of a light guide that is a light guide member that is retrofitted to the board. This will be explained in detail below.

In the third embodiment, the light emitting element 101, the electronic circuit element 102, and the light receiving element 103 are first mounted on the same surface of the substrate 104, and the casing 108 is attached to the substrate 104 later. The black casing 108 includes a first hollow part 108a having a first reflective surface 109a, a second hollow part 108b having a second reflective surface 109b, and a first hollow part 108a and a second hollow part 108b. A connecting portion 108c that connects the portion 108b is integrally formed. The first hollow portion 108a includes a first reflective surface 109a that reflects the light emitted from the light emitting element 101, and a first slit that allows the light reflected by the first reflective surface 109a to pass toward the space 110. 108d. The second hollow part 108b is provided opposite to the first hollow part 108a with a space 110 in between. The second hollow portion 108b has a second slit 108e that receives the light that has passed through the space 110, and a second reflective surface 109b that reflects the light that has passed through the second slit 108e toward the light receiving element 103. .

When the housing 108 equipped with the reflective surfaces 109a and 109b is later assembled to the substrate 104, it is necessary to position the reflective surfaces 109a and 109b at appropriate positions in order to guide the light from the light emitting element 101 to the light receiving element 103. There is. Therefore, when the casing 108 is retrofitted to the board 104, a gap is created between the connecting portion 108c of the casing 108 and the board 104, as shown in FIG. In order to assemble without creating a gap, the shape of the housing 108 needs to be devised, which is not easy. If there is a gap between the connecting portion 108c of the housing 108 and the substrate 104, the light emitted from the light emitting element 101 in the horizontal direction passes through the gap and reaches the light receiving element 103, as shown by the dotted line in FIG. This creates a path for direct input to the

As described above, in the optical sensor, if there is light that is directly incident on the light receiving element 103 from the light emitting element 101, the presence or absence of a detection object in the space 110 cannot be correctly determined.

Therefore, in the optical sensor according to the third embodiment, the electronic circuit element 102 is mounted between the light emitting element 101 and the light receiving element 103 on the mounting surface (same surface) of the substrate 104. Thereby, the electronic circuit element 102 can block the path of light that is directly incident on the light receiving element 103 from the light emitting element 101.

As described above, in the configuration in which the casing is assembled afterward after the light emitting element and the light receiving element are mounted on the same surface of the board, the electronic circuit element is mounted between the light emitting element and the light receiving element. Thereby, an optical sensor that is not affected by stray light even if a gap occurs between the connecting portion of the board and the housing can be realized with an inexpensive and simple configuration.

Further, since there is no need to provide the housing with a mechanism for preventing light from directly entering the light-receiving element in the horizontal direction from the light-emitting element, the housing can be constructed at low cost and simple.

100...Optical sensor 101...Light emitting element 101a...Light emitting source 102...Electronic circuit element 103...Light receiving element 103a...Light receiving area 104...Substrate 105...Light guide 105a...First light guide section 105b...Second light guide section 105c ...Connection part 108 ...Casing 108a ...First hollow part 108b ...Second hollow part 108c ...Connection part 108d ...First slit 108e ...Second slit 109a ...First reflective surface 109b ...Second reflection Surface 110...Space 111...Current limiting resistor 112...Pull-up resistor

Claims (6)

a light emitting element that emits light;
a light receiving element that receives light from the light emitting element through a space through which the detection object passes;
multiple electronic circuit elements;
An optical sensor that detects the object by blocking the light from the light emitting element in the space,
The light-emitting element, the plurality of electronic circuit elements, and the light-receiving element are mounted on the same surface of the substrate, and the plurality of electronic circuit elements are arranged between the light-emitting element and the light-receiving element on the mounting surface of the substrate. It is located
The plurality of electronic circuit elements are arranged at different positions in a direction intersecting a line connecting the center of the light emitting source of the light emitting element and the center of the light receiving area of the light receiving element. sensor. a first light guiding portion that guides the light emitted from the light emitting element in a direction passing through the space;
a second light guide section that is provided opposite to the first light guide section through the space and guides the light that has passed through the space to the light receiving element;
a light guide member integrally formed with a connecting part that connects the first light guide part and the second light guide part;
Equipped with
The optical sensor according to claim 1 , wherein the electronic circuit element is disposed between the light emitting element and the light receiving element at a position corresponding to the connecting part. a first hollow portion having a first reflective surface that reflects light emitted from the light emitting element and a first slit that allows the light reflected by the first reflective surface to pass toward the space;
a second slit that is provided opposite to the first hollow part through the space and receives light that has passed through the space; and a second slit that reflects the light that has passed through the second slit toward the light receiving element. a second hollow portion having a reflective surface;
a black casing in which a connecting part connecting the first hollow part and the second hollow part is integrally formed;
Equipped with
The optical sensor according to claim 1 , wherein the electronic circuit element is disposed between the light emitting element and the light receiving element, and between the substrate and the connecting part of the casing. . The light emitting element has a light emitting source that emits light,
The light receiving element has a light receiving area that receives light,
4. The optical system according to claim 1, wherein the electronic circuit element is arranged on a line connecting a center of a light emitting source of the light emitting element and a center of a light receiving area of the light receiving element. formula sensor. 5. The optical sensor according to claim 4 , wherein the electronic circuit element is a reflow-mountable element and is part of a component constituting a drive circuit that drives a light emitting element or a light receiving element. 6. The optical sensor according to claim 1, wherein the light emitting element is a surface mount type LED, and the light receiving element is a surface mount type phototransistor.

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